Suction and delivery pump of the rotary type



Aug. 12 1924.

P. VOREAUX SUCTION AND DELIVERY PUMP OF THE ROTARY TYPE I Filed Aug; 10, 1922 4 Sheets-Sheet 1 /////////////////////////IIII 4/4 my I A111 1% B EQZQO P. \JQREAUX suc'non AND DELIVERY PUMP OF THE ROTARY TYPE Filed 10 1923 4 Sheets-Sheet 2 Aug. a 19240 P. VOREAUX SUCTION AND DELIVERY PUMP OF THE ROTARY TYPE Filed Aug. 10 1922 4 ShMtzv-Sheet 3 x 13;; NM 9% w% @v 4 Sheets-Sheet 4 P. VOREAUX SUCTION AND DELIVERY PUMP OF THE ROTARY TYPE Patented Aug. 12, 1924.

UNITED stars-s.

, 1,504,995 PATENT ounce- PAUL vonnnux, cereals, uaaucnnssiemeeo scorers \ANONYME savox, or

' rams, FRANGE.

SUCTION AND DELIVERY PUMP O E'TZHE ROTARY TYPE.

Application area Augie 10., 1922. Serial No. 5 1,001.

7 '0 aZZ whom it may concern Be it known that I, PAULVOREAUX, a citizen of France, and a resident of Paris, France,'have invented certain new and useful Improvements in Sucti'onand" Delivery Pumps of the Rotary Type, which are fully set forth in the following specification.

. This invention relates to various forms of construction of a rotary pump which can be employed as a vacuumpump or compressor, or as a liquid pump, and can be-so constructed as to obtain a largeioutputwith a very small size. The said pump is of the type comprising a fixed pump bodyhaving revoluble therein a cylinder set which actuates a plurality of pistons whose rods have their pivoting point in eccentric position with reference to thee axis of rotation'of the cylinder set. I

The said pump is chiefly"characterized by the following points:

1. The pistonrods slidable in the pistons have a much reduced length so that the rotating masses formed by the pistons shall.

be as near as possible to the center.

2. The pistons are mounted together on the axle or eccentric member in the following manner. One of'saidpistonrods is straight and it ends ina circular-bearing portion-whilst the other two rods are bent at the ends so as to fit uponeither side of said bearing portion in order to provide-- a combined unit piece in which is engaged a false hub; the ends of the piston-rods and the said false hub are rigidly secured; together for example by means of three bolts.

3. The interior of the pump or the space between the pistons is connected with the suction in such manner that the vacuum produced in the pump shall counterbalance the effect of centrifugal force.

The pump as a whole is constructed so as to afford the minimum size and an exactly balanced operation such as cannot be obtained with the usual pumps with piston rod.

4. The piston rods can be made independent while secured to the piston, and shall be slidable upon said eccentric axle as well as revoluble thereupon.

The following description, together with the accompanying drawings which are given by way of example, sets forth this invention.

Fig. 1 is a cross-section of one form of the unit composedof the cylinders b which is disposed upon theshaft a having'mounted thereuponattheex'terior of the pump a driving pulley'al and a loose pulley (P, Fig.

In the" cylinder unit '6 are formed three cylinders wherein are movable the pistonse 6 e The piston rods have a very shortflength so asto reduce the size and the centrifugalforce. Theyare assembled and rotate togetlierupona fixed axle f which is eccentric with respect to the shaft 0 whereby the pistonsshall be displaced within the cylinders. The said pistons are revolubly mounted" upon the axle f in the following manner: w

7 The rod ofpistoii e is'straight and hasa circu 'ar bearing; portion wherein is disposed the false hub h. The rod 9 of piston e is bent to the left, whilstthe rod -9 of piston e is bent to the right," the ends of the rods 9 being disposed on'eith er side of the circular bearing portion of the rod 9 and being also provided with circular bearing portions in which is engaged the false hub h. Thewhole thus forms a combined unit which is held together by three bolts '5. The said false hub is journalled upon the end of the fixed shaft 7 by means of the ball-bearings 7'. In order to provide for the motion of the pistons in the cylinders, said piston rods are slidable on the axles is mounted within the pistons e.

The main body a communicates with the suction conduit Z and delivery conduit m, Fig. 1. The device as a whole is so disposed that when a piston moves before the suction conduit l it will be on the downward stroke, i. e., in the suction period, as for piston e in Fig. 1. Upon receding from said suction conduit, the cylinder commences the upward stroke or compression period, as for cylinder e in Fig. 1; when opposite the compression conduit m it is near the upper dead center and therefore the air in the cylinder is at the maximum compression, as for cylinder 6 in Fig. 1. The cylinder recedes from the compression conduit at the moment when it reaches the upper dead center or at the beginning of the suction period.

To counterbalance the effects of centrif-i ugal force, the portion situated inwardly of the three pistons is connected by a conduit n with the suction conduit, as shown inthe mixed lines in Fig. 1, and therefore the pressure within said pistons will be a minimum, and thiswill tend to counterbalance the centrifugal force. v

In the form of construction shewn in Figs. 4 and 5, the pump is adapted towithstand high pressures and can be employed for raising liquids to a considerableheight or as a gas compressor; the pistonrods g 9 g and the false hub h are in this case secured directly to the shaft f which latter is revoluble in the ball-bearing j Fig. 5, provided in the end plate of the main body a. By this disposition of the piston rods the pump will have a very strong construction in spite of its reduced size.

The ends 0 0 0 of said piston rods, Figs. 4 and 5 have a plane surface and co operate with the surfaced portion p of the space provided within the pistons for the sliding motion of the piston rods on the axles is, This disposition increases the contact surface between rods and pistons thereby reducing the pressure of the friction parts, these being under constant lubrication 'by oil which is thrown by centrifugal force. The check valve. 9 is disposed upon the outlet so that the pump can be used as a compres sor.

Figs. 6 and 7 show a modified form of construction of small-sized pumps wherein the particular feature consists in the arrangement of the piston rods in the pistons. The axle is formerly used is replaced by a T-shaped slot formed within the piston, and the piston rods 9 have a base portion of like shape which is slidable in said slot. The false hub h is also eliminated, and the set of piston rods rotates directly upon the eccentric axle f.

It is obvious that the said apparatus is susceptible of all desired modifications in detail without departing from the principle of this invention, and that the said pump can be used as a motor by employing a fluid under pressure.

What I claim is:

l. A rotary apparatus comprising a sta tionary casing, a unit set of revoluble cylinders, pistons movable within said cylinders and actuated by the movement of the latter, piston rods independent of each other whereof the ends are in contact and staggered in the lengthwise sense, a stationary shaft in eccentric position with respect to the axis of rotation of said cylinder set. and extending through the ends of the piston rods, and means permitting said pistons to rotate upon said eccentric shaft while slid-- ing Within the cylinders.

2. A rotary apparatus comprising a sta tionary casing, a unit set of revoluble cylinders, pistons movable within said cylin ders and actuated by the movement of the latter, piston rods independent of each other whereof the ends are in contact and staggered in the lengthwise sense, a stationary shaft in eccentric position with respect to the axis of rotation of said cylinder set and extending through the ends of the piston rods, cross-pieces secured to the pistons and. having the piston rods slidable thereon. whereby the pistons are rotatable upon said eccentric shaft while sliding within the cylinders.

In testimony whereof I have signed this specification PAUL VOREAUX. 

